After a major storm, the most dangerous problems are not always visible. Floodwater can reach electrical equipment before homeowners notice it. Downed lines can appear inactive but remain energized. Generator exhaust can enter a home. A flood-exposed air handler can spread contaminants if it is restarted without evaluation.
Slowing down before turning systems back on is not overcaution. It can be the difference between a manageable inspection and a preventable emergency.
Do Not Reenter Until Authorities Clear the Area
Follow local emergency instructions before reentering your home after a significant storm. Assume every downed power line is energized and avoid the line, nearby fences, vehicles, tree limbs, and standing water. Do not enter a structure that appears unstable or smells of gas. Use flashlights rather than candles when power is out.
Electrical Safety After a Storm
Do not touch wet electrical equipment or enter standing water near outlets, appliances, extension cords, or an electrical panel. If the panel, meter, wiring, receptacles, or other electrical equipment was exposed to floodwater, have a licensed electrician evaluate it before power is restored. Do not repeatedly reset a breaker that trips after the storm.
What to Check Before Restoring Power
From a safe, dry location, look for standing water, sparks, smoke, burning odors, visible wiring damage, or damage to the service mast and utility connection. Do not remove the panel cover. If the home flooded to outlet height, the panel is wet or damaged, or you would need to stand in water to reach electrical controls, stop and call a licensed electrician.
Generator Safety After the Storm
Operate portable generators outdoors at least 20 feet from doors, windows, and vents, with exhaust directed away from the home. Never operate one in a home, garage, carport, shed, or other enclosed or partly enclosed area. Never plug a generator into a wall outlet. Use an approved transfer switch or connect appliances as directed by the manufacturer, let the generator cool before refueling, and use working battery-operated or battery-backup carbon monoxide alarms.
HVAC Safety After a Storm
Do not restart an outdoor unit that was submerged or surrounded by floodwater. Check the indoor air handler and accessible ductwork for water exposure without touching wet electrical components. Flood-exposed HVAC equipment and duct systems may need professional evaluation, cleaning, repair, or replacement before operation.
If the AC breaker trips, the outdoor fan does not turn, the system smells burnt, produces only warm air, makes new grinding or rattling sounds, or the indoor unit shows water damage, leave it off and request service.
When to Request Immediate Electrical or HVAC Help
Call an electrician for sparks, smoke, burning odors, a hot or buzzing panel, repeated breaker trips, warm or discolored devices, damaged service equipment, or flood-exposed wiring and controls. Request HVAC service for submerged equipment, restart failures, tripping breakers, burnt odors, new mechanical noise, warm-air-only operation, or floodwater exposure at the air handler or ductwork. Treat fire, active arcing, gas odors, and downed lines as emergencies and follow local emergency directions.
Avoid Post-Storm Panic Decisions
Before approving major replacement work, ask what specifically failed, what evidence supports the recommendation, whether the damage is storm-related or preexisting, and which work is immediately necessary. Photograph visible damage when it is safe to do so and keep written estimates for insurance documentation. A reputable professional should explain the findings clearly and distinguish urgent safety work from optional improvements.
Common questions
Frequently asked questions
When is it safe to restore power after a storm?
Restore power only after authorities permit reentry and there is no standing water, gas odor, structural danger, damaged service equipment, or flood-exposed electrical equipment. If the panel, meter, wiring, outlets, or appliances were wet, have a licensed electrician evaluate them before energizing the system.
Can I restart an air conditioner after floodwater surrounded the unit?
Do not restart HVAC equipment that was submerged or exposed to floodwater. Leave it off and have the outdoor unit, indoor air handler, electrical controls, and any affected ductwork evaluated before operation.
How far should a portable generator be from the house?
CDC guidance says to operate a portable generator outdoors at least 20 feet from doors, windows, and vents, with exhaust directed away from the home. Use working carbon monoxide alarms and never operate a generator in a garage, carport, shed, or enclosed area.
Sources and further reading
Unsure whether your systems are safe to restart?
Bright Day Electric and Air Oasis provide post-storm electrical and HVAC evaluations across Jacksonville and Northeast Florida.
About the author: Freddie Zeringue is a former publisher, journalist, and author based in Jacksonville, Florida. He spent 18 years as a Natural Awakenings franchise publisher overseeing editorial and design operations and has authored three published books. He has been a technical writer in the home service industry and venture capital space since 2016.